condition mean min max ZT0-3 12.49244 12.49244 12.49244 ZT4-7 14.3296675 14.3296675 14.3296675 ZT8-11 11.6998485 11.6998485 11.6998485 ZT12-15 13.434660000000001 13.434660000000001 13.434660000000001 ZT16-19 11.5662825 11.5662825 11.5662825 ZT20-23 12.663138499999999 12.663138499999999 12.663138499999999